KR20160138750A - Compressor with an oil return means - Google Patents

Abstract

The present invention relates to a compressor comprising an oil return unit. According to one aspect of the present invention, provided is a compressor comprising an oil return unit. The compressor of the present invention includes: a main housing; a swiveling scroll installed in the housing while being able to swivel; a fixed scroll forming a compression compartment by being interlocked with the swiveling scroll; and a subsidiary housing comprising a discharge space linked with a discharge side of the fixed scroll and a collection space which stores the oil collected in the discharge space temporarily. The compressor also includes: an oil return flow path which is formed in the fixed scroll and is linked with the collection space; and an oil supply flow path which is formed in the main housing, and is linked with the oil return flow path, and is formed by being branched to supply oil to at least two places. The compressor of the present invention can supply the returned oil into the housing of the compressor efficiently.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a compressor having oil recovery means,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a compressor having oil recovery means, and more particularly, to a compressor having means for recovering oil mixed in a discharged refrigerant into a space inside the compressor.

Generally, an automobile is provided with an air conditioner (A / C) for cooling and heating the room. Such an air conditioner includes a compressor that compresses gaseous low-temperature and high-pressure gaseous refrigerant introduced from an evaporator into gaseous refrigerant of high temperature and high pressure and sends it to a condenser.

The compressor includes a reciprocating type compressing the refrigerant according to the reciprocating movement of the piston, and a rotary type compressing while rotating. In the reciprocating type, there are a crank type which uses a crank according to a transmission method of a drive source and a crank type which transmits the same to a plurality of pistons, a swash plate type which transmits a swash plate with a swash plate type rotary shaft, a vane rotary type using a rotary shaft, There are scrolling expressions using orbiting scroll and fixed scroll.

The compressor compresses the refrigerant by rotating the rotor to drive the compression unit. Since the rotary bodies such as the rotor and the driving units of the compression unit perform repetitive friction movements with the stationary body, lubrication is indispensable. Particularly, in the scroll compressor, lubrication between the fixed scroll and the orbiting scroll is more important. In order to minimize power loss and prevent damage due to abrasion, friction between the fixed scroll and the orbiting scroll should be minimized, but in order to improve the compression efficiency, the refrigerant leakage between the fixed scroll and the orbiting scroll should be minimized.

Therefore, conventionally, a method has been used in which oil is mixed with a refrigerant to lubricate a mechanical friction portion in the compression chamber. According to this method, the oil supply structure can be simplified and efficient, but there is a problem of reducing the oil level due to the oil mixed into the refrigerant and discharged to the outside of the compressor.

To this end, an oil separator is used with the compressor. In some cases, an oil separator provided separately from the compressor may be used. However, if the installation space is narrow, such as an automobile, the oil separator may be integrally formed in the compressor housing. The oil separator collides with the discharged refrigerant and collects the mixed oil and recovers the oil back into the compressor. However, when supplying the recovered oil to the inside of the compressor, it is necessary to supply the oil to the necessary portion at a proper flow rate, but there is a problem that the oil supply flow path becomes complicated. Therefore, it is necessary to provide a means for supplying the recovered oil efficiently while simplifying the oil supply passage.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a compressor having oil recovery means capable of efficiently supplying recovered oil into a compressor housing.

According to an aspect of the present invention, there is provided a portable terminal comprising: a main housing; A orbiting scroll pivotally mounted on the housing; A fixed scroll engaging with the orbiting scroll to form a compression chamber; And an auxiliary housing having a discharge space communicated with the discharge side of the fixed scroll and a collecting space in which the oil collected in the discharge space is temporarily stored, wherein the auxiliary housing is formed in the fixed scroll and communicates with the collecting space Euro; And an oil supply passage formed in the main housing, the oil supply passage branched from the main housing to communicate with the oil return passage and supplying oil to at least two locations.

According to an aspect of the present invention, one oil passage is formed on the fixed scroll side and another component arranged in parallel to the fixed scroll, for example, another passage communicating with the oil passage is formed in the main housing. So that the oil can be supplied to the places.

Here, the main housing may be provided with a suction space for receiving a rotary shaft, and the oil supply passage may include a first oil supply passage communicating with the suction space.

Further, a back pressure chamber is formed between the back surface of the orbiting scroll and the opposed surface of the main housing, and the oil supply passage may include a second oil supply passage communicating with the back pressure chamber.

Further, the oil return passage may be provided with a pressure reducing means.

At this time, an installation space for inserting the decompression means is formed in the oil recovery channel, and the inner diameter of the installation space may be formed to have an inner diameter larger than an inlet port of the oil recovery channel.

On the other hand, the refrigerant pressure at the discharge side of the first oil supply passage may be formed to be lower than the refrigerant pressure at the discharge side of the second oil supply passage.

Here, the pressure reducing means may be provided in the first oil supply passage.

Here, the first oil supply passage may be provided with an installation space for inserting the decompression means, and the inner space of the installation space may be formed to have a larger inner diameter than the discharge port of the first oil supply passage.

In addition, the first and second oil supply passages may have a common inlet communicating with the discharge port of the oil return passage.

Between the orbiting scroll and the main housing, a sealing means for sealing the back pressure chamber is provided, and the common inlet port can be disposed radially outward of the sealing means.

Further, the pressure-reducing means may include an oil feeding member having an oil feeding groove formed on an outer circumferential surface thereof and spirally extending along the longitudinal direction.

Here, the oil transfer member may have a hydraulic pressure space therein and a communication hole communicating with the hydraulic pressure space may be formed at one end thereof.

In addition, a cover that fits on the outer circumferential surface of the oil feed member may be further included.

In addition, the pressure reducing means may include an oil transfer member having an oil transfer groove formed therein extending spirally along the longitudinal direction.

Here, the oil transfer member may have a hydraulic pressure space therein and a communication hole communicating with the hydraulic pressure space may be formed at one end thereof.

Further, the decompression means includes an oil transfer member; And a cover fitted to the outer circumferential surface of the oil transfer member and having an oil transfer groove formed on an inner wall thereof so as to extend spirally along the longitudinal direction.

Further, a sealing means for preventing refrigerant leakage between the fixed scroll and the main housing is interposed between the fixed scroll and the main housing, and the sealing means is provided with a sealing means for communicating the oil return flow passage with the first oil supply flow passage A through hole can be formed.

In addition, the decompression means may be made of a material having lower rigidity than the fixed scroll and the main housing.

According to another aspect of the present invention, there is provided a vacuum cleaner comprising: a main housing having a suction space for receiving a rotating shaft; A orbiting scroll pivotally mounted on the housing; A fixed scroll engaging with the orbiting scroll to form a compression chamber; An auxiliary housing having a discharge space communicated with the discharge side of the fixed scroll and a collecting space in which the oil collected in the discharge space is temporarily stored; A back pressure chamber formed in the main housing, the pressure being applied to press the orbiting scroll to the fixed scroll side; An oil recovery flow path formed in the fixed scroll to communicate with the collection space and having a depressurizing means therein; A first oil supply passage formed in the main housing and extending between the oil return passage and the suction space; Pressure reducing means provided respectively in the oil return passage and the first oil supply passage; And a second oil supply passage branched from the two pressure reducing means and communicating with the back pressure chamber.

Here, the second oil supply passage may have an inlet at one end of the main housing.

Between the orbiting scroll and the main housing, a sealing means for sealing the back pressure chamber is provided, and the inlet may be disposed radially outward of the sealing means.

At least one of the oil return passage and the first oil supply passage may be provided with an installation space for inserting the decompression means, and a step may be formed at one end of the installation space.

Here, the stepped portion may be formed so as to prevent movement of the decompression means and position the decompression means in the correct position.

Further, a sealing means for preventing refrigerant leakage between the fixed scroll and the main housing is interposed between the fixed scroll and the main housing, and the sealing means is provided with a sealing means for communicating the oil return flow passage with the first oil supply flow passage A through hole can be formed.

The depressurizing means may include an oil transfer member having an oil transfer groove for forming a movement path of the oil together with the inner wall of the main housing or the fixed scroll.

Here, the oil transfer member is configured to allow a part of the oil to flow into the oil transfer member, and may be configured to expand toward the inner wall by the pressure of the oil that is introduced.

Further, the oil transfer member may be made of a material having lower stiffness than the fixed scroll and the main housing.

Further, the pressure reducing means may include a cover that is fitted to the outer peripheral surface of the oil feed member.

In addition, the pressure reducing means may include an oil transfer member having an oil transfer groove formed therein extending spirally along the longitudinal direction.

The decompression means may include an oil transfer member; And a cover fitted to the outer circumferential surface of the oil transfer member and having an oil transfer groove formed on an inner wall thereof so as to extend spirally along the longitudinal direction.

According to an aspect of the present invention having the above-described structure, the oil supply passage can be simplified by including one recovery flow passage disposed in the fixed scroll and a plurality of supply passage arranged in the main housing.

Further, since the oil can be independently supplied to the back pressure chamber and the suction space by the plurality of supply passages, it is possible to efficiently supply the oil. In particular, since the oil supply passage including the oil supply passage directly communicating with the back pressure chamber is included, the lubricating performance in the back pressure chamber can be improved as compared with the case where the oil is indirectly supplied to the back pressure chamber conventionally.

Further, by providing additional depressurizing means in the suction space, it is possible to supply the oil to a plurality of spaces having different pressures.

In addition, since the pressure reducing means includes the oil transfer member or the cover, it is possible to prevent the oil transfer path from being damaged in the process of assembling the product so that the oil supply becomes poor.

1 is a sectional view showing an embodiment of a compressor according to the present invention.
Fig. 2 is a cross-sectional view showing an enlarged part of Fig. 1. Fig.
Fig. 3 is a cross-sectional view of the portion shown in Fig.
4 is a perspective view showing the decompression means shown in Fig.
5 is a sectional view showing the internal structure of the decompression means.
6 is an exploded perspective view showing a modified example of the decompression means.
Fig. 7 is a view corresponding to Fig. 2 showing a state in which the decompression means shown in Fig. 6 is applied.
8 is a perspective view showing still another modification of the decompression means.
9 is an exploded perspective view of the decompression means shown in Fig.
10 is a perspective view showing still another modification of the decompression means.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a compressor having oil recovery means according to the present invention will be described in detail with reference to the accompanying drawings.

Referring to Figure 1, a first embodiment of a compressor according to the present invention is shown. The first embodiment 100 includes a main housing 110 having a space in which unillustrated driving means, for example a motor, is housed. The main housing 110 has a generally cylindrical shape, and the space in which the driving means is housed functions as a suction space 111 in which the refrigerant, which is the object of compression, temporarily stays before being introduced into the compression means.

A counter shaft 114 is fixed to the end of the rotating shaft 112 by a fixing pin 113 inserted into the end of the rotating shaft 112. The rotating shaft 112 is fixed to the rotating shaft 112, . The counter mass 114 is mounted to cancel the vibration due to the eccentric rotation of the orbiting scroll to be described later, and the end of the counter mass is coupled to the back surface of the orbiting scroll 130 through the bearing 115.

Here, a back pressure chamber 116 is formed at one end of the main bearing 110 (left end with reference to FIG. 1). The back pressure chamber 116 is formed to accommodate the above-described counter masses, and is formed so that an end portion thereof opened by the orbiting scroll 130 is covered. Accordingly, the back pressure chamber 116 can be defined as a space closed by the main housing and the orbiting scroll.

On the other hand, a first oil supply passage 117 is formed below the main housing 110. One end of the first oil supply passage 117 is exposed to the end of the main housing and the other end of the first oil supply passage 117 is connected to the suction space 111. Specifically, the exposed end portion functions as an inlet 117a of the refrigerant, and the end portion disposed on the suction space side functions as a discharge port 117b. Therefore, the refrigerant flowing into the inlet port can be discharged into the suction space along the first oil supply passage 117.

On the other hand, the second oil supply passage 118 is branched from the inlet 117a. The second oil supply passage 118 extends from the inlet 117a to the back pressure chamber 116 and has a discharge port 118a communicating with the back pressure chamber 116. [ That is, although the first and second oil supply passages have a common inlet 117a, their respective outlets are disposed on the suction space and the back pressure chamber, respectively. Therefore, the introduced refrigerant is divided into the suction space and the back pressure chamber and is supplied. Here, a decompression means 150 to be described later is disposed in the first oil supply passage 117. The depressurizing means 150 is configured to lower the pressure of the refrigerant introduced into the inlet 117a to the pressure of the suction space. The depressurizing means 150 is inserted into the first oil supply passage 117, An insertion space 119 is formed.

The insertion space 119 is formed to communicate with the first oil supply passage 117 and has an inner diameter larger than an inner diameter of the discharge port 117b. As a result, a step portion 119a is formed at the downstream end of the insertion space 117. That is, the insertion space 119 extends to one end of the main housing 110 and the other end communicates with the discharge port 117b so that the decompression means 150 can be inserted from one end of the main housing 110 . At this time, not only does the step portion 119a function as a stopper for allowing the decompression means to be in a fixed position, but also the refrigerant having passed through the decompression means 150 flows into the discharge port 117b, So that it can be caused.

The fixed scroll 120 is coupled to the left end of the main housing 110. The fixed scroll (120) includes a scroll (122) engaging with the scroll (132) of the orbiting scroll, and a compression space is formed therebetween. A discharge port 124 is formed at a substantially central portion of the fixed scroll 120 so that the compressed refrigerant can be discharged to the outside of the fixed scroll. An oil return flow path 126 communicating with the first oil supply flow path 117 described above is formed below the fixed scroll 120. The oil recovery flow path 126 extends between both ends of the fixed scroll, and as shown in FIG. 2, a spiral inlet 126a and a discharge port 126b are disposed at both ends. The discharge port 126b communicates with an installation space 128 in which the decompression means 150 is disposed and the installation space 128 provides a space for inserting the decompression means 150 as described above . Through this, a step portion 126c is formed on the side of the inlet 126a, so that the decompression means can be positioned in the correct position.

The discharge port 128b communicates with the inlet 117a of the first oil supply passage. In addition, the oil return passage is provided with a pressure reducing means 150 to reduce the pressure of the oil to a pressure that is higher than the pressure in the suction space (hereinafter referred to as suction pressure). Accordingly, the inlet 117a is supplied with the pressure between the suction pressure and the discharge pressure, and this can be adjusted so as to coincide with the pressure required in the back pressure chamber.

A gasket 121 (see FIG. 3) is disposed between the fixed scroll 120 and the main housing 110 to prevent leakage of the refrigerant. The gasket 121 has a through hole 121a communicating with the oil return passage and the first oil supply passage, respectively, so that the recovered oil can flow into the first oil supply passage. Here, the gasket 121 is inserted to prevent leakage between the fixed scroll and the main housing as described above. However, the gasket 121 is formed to prevent leakage between the oil return passage and the first oil supply passage Function can also be combined.

The orbiting scroll 130 is disposed between the fixed scroll 120 and the main housing 110. The orbiting scroll 130 is configured to pivot relative to the main housing 110, as described above. However, it is coupled by the rotation preventing groove 134 and the guide pin 136 in order to prevent the orbiting scroll 130 from rotating.

The orbiting scroll should be in close contact with the fixed scroll with a proper degree of pressure. To this end, the orbiting scroll is mounted on the rotary shaft movably along the axial direction, and the degree of pressing of the orbiting scroll with respect to the fixed scroll can be adjusted according to the pressure applied to the back pressure chamber. Various pressures from the suction pressure to the discharge pressure are applied to the left side surface of the orbiting scroll, and an intermediate pressure between the suction pressure and the discharge pressure is applied to the back pressure chamber so as to balance the pressure. In order to keep the pressure in the back pressure chamber at an appropriate level, a sealing means 138 is disposed so as to surround the back pressure chamber.

On the other hand, the pressure applied to the back pressure chamber is applied by introducing a part of the refrigerant under compression into the back pressure chamber. To this end, a back pressure passage passing through both ends of the orbiting scroll is formed, and both end portions of the back pressure passage are communicated with the compression chamber and the back pressure chamber, respectively.

An auxiliary housing (140) is disposed at a left end of the fixed scroll (120). The auxiliary housing provides a discharge space 142 communicated with the discharge port 124 and the intermediate flow path 141 so that the compressed refrigerant flows into the discharge space 142. The compressed refrigerant thus introduced is discharged to the outside of the compressor through a discharge port (not shown). In the discharge space 142, a oil separator 144 arranged to communicate with the discharge port is disposed.

The oil separator 144 has a hollow tube shape and is disposed such that only one end thereof communicates with the discharge port. Therefore, the compressed refrigerant flowing into the discharge space is struck against the inner wall of the discharge space including the oil separator until the refrigerant is discharged to the outside through the discharge port. In this process, the oil mixed in the compressed refrigerant is separated, I stay inside.

The separated oil is accumulated in the trapping space 145 provided below the discharge space 142 by its own weight. The trapping space 145 communicates with the oil return flow path 126 through the return flow path 148. As a result, the separated oil can be introduced into the oil return passage. The inflowing oil is distributed to the back pressure chamber and the suction space in accordance with the pressure difference caused by the pressure reducing means. At this time, the oil can be supplied while filtering the foreign matter through the filter 146.

Now, the operation of the above embodiment will be described.

The refrigerant flowing into the compression chamber from the suction space is compressed together with the oil and then discharged to the outside through the discharge space 142. In this process, a part of the mixed oil is separated from the auxiliary housing, is collected in the collection space 145, and then flows into the oil return flow path 126 via the filter 146. [ Then, while passing through the decompression means 150, the pressure is reduced to a pressure similar to that of the back pressure chamber and is introduced into the first and second oil supply passages.

A part of the introduced oil flows into the suction space through the first oil supply passage and the remaining part flows into the back pressure chamber through the second oil supply passage. At this time, the oil is reduced in pressure to the suction pressure by the decompression means provided in the first oil supply passage, and is re-supplied to the suction space. Therefore, by providing a plurality of flow paths and providing a part of the pressure reducing means, it is possible to supply the oil having a desired pressure to a necessary place inside the compressor.

Further, the oil is distributed from one oil returning passage without constituting the whole of the individual oil passage, so that the internal structure of the compressor can be simplified, and the rigidity of the housing can be improved.

Further, since the inlet port of the second oil supply passage is disposed radially outward of the sealing means and penetrates the inside of the main housing, oil can be supplied more smoothly than when the oil supply passage is formed along the sealing means. Further, by using the two depressurizing means, the inlet port of the second oil supply passage is disposed at the intermediate pressure applying point, so that even if the inlet port is provided outside the sealing means, the concern about leakage can be eliminated.

On the other hand, the decompression means may have any form. That is, the depressurization means may be realized by reducing the cross-sectional area of the oil recovery passage or a part of the oil supply passage, or may be implemented by inserting another decompression means as shown in the figure.

2 and 3 show one example of such a pressure reducing means, and the pressure reducing means 150 is embodied as an oil feeding member having a cylindrical shape extending in the longitudinal direction. Here, the decompression means may be formed in the same manner as the decompression means. Hereinafter, the decompression means is referred to as an oil feed member for convenience of explanation. A helical oil transfer groove 152 extending along the longitudinal direction is formed on the outer circumferential surface of the oil transfer member. The oil transfer groove 152 provides the oil transfer path together with the inner wall of the first oil supply passage.

Conventionally, in the present invention, the depressurization means is provided in the interior of the space after the space for installing the depressurization means is provided, as compared with the conventional depressurization method in which the inside of the passage through which the oil passes is made to have a specific shape. It can be easily installed and the manufacturing process can be simplified.

Here, the decompression means may be made of any material. For example, the decompression means may be made of a material having a stiffness lower than that of the portion to which the decompression means is inserted. In the above embodiment, the fixed scroll and the main housing may be made of cast iron or carbon steel. In this case, the depressurizing means may be made of a material having a lower rigidity, for example, a resin material. By making the decompression means have lower stiffness, the decompression means can be fixed in the fitting space formed in the fixed scroll and the main housing.

This not only eliminates the need for a separate fixing means but also allows a certain degree of machining tolerance to be absorbed while deforming the decompression means, thereby simplifying the manufacturing process.

5, the oil transfer member 150 has a hollow shape and has an open end 151 at one end thereof. The oil transfer member 150 is connected to the inner space of the oil transfer member through the open end 151 153 are communicated with the outside. The other end opposite to the open end 151 is a closed end. Here, the open end 151 is disposed so as to oppose the relatively high pressure side among the opposite end portions of the oil transfer member. For example, the oil transfer member 150 disposed in the oil return passage may have an open end 151 disposed on the discharge space side, and the oil transfer member 150 disposed in the first oil supply passage may communicate with the fixed scroll The open end 151 is disposed so as to face the open end 151. [

Therefore, a part of the oil flows into the internal space 153, that is, the water pressure space through the open end 151. The oil thus introduced pressurizes the oil transfer member toward the radially outer side, that is, toward the inner wall of the installation space 128. Thus, the oil transfer groove 152 formed on the outer circumferential surface of the oil transfer member 150 is brought into close contact with the inner wall of the installation space, so that the oil flows across the oil transfer groove (from the left to the right with reference to FIG. 5) It is prevented from moving. As a result, the spiral movement of the oil is promoted, the flow path of the oil is increased, and the effect of reducing the pressure can be increased.

That is, when the oil passing through the first oil supply passage 117 reaches the oil transfer member 150, the oil moves along the oil transfer groove 152 and passes through the oil supply passage 117. The oil transfer groove 152 is formed like a thread on the outer circumferential surface of the cylindrical oil transfer member 150, the movement distance becomes longer as compared with the oil passing straight through the oil supply passage 117, thereby reducing the pressure of the oil. The reduced pressure oil is supplied to the suction space to lubricate the rotary shaft or the drive means.

Meanwhile, the decompression means may be realized in the form shown in FIG. 4 and FIG. 4 and 5, the modified example includes a cover 154 that is fitted to the outer circumferential surface of the oil transfer member 150. As shown in FIG.

The cover 154 is formed in a tubular shape and is fitted to the outer circumferential surface of the cylindrical oil transfer member 150. Accordingly, the oil transfer groove 152 formed on the outer circumferential surface of the oil transfer member 150 is covered by the cover 154, and when assembled, the oil return passage formed in the fixed scroll or the main housing, And the oil transfer groove 152 is prevented from bumping into the inner wall.

The inner diameter of the cover 154 is formed to be the same as the outer diameter of the oil transfer member 150 so that the tip of the oil transfer groove 152 and the inner wall of the cover 154 are closely contacted. Therefore, as shown in FIG. 5, the inner wall of the cover 154 and the oil transfer groove 152 form a passage for transferring the oil. The outer diameter of the cover 154 is formed to be the same as the inner diameter of the oil supply passage so that the cover 154 is fitted in close contact with the inner wall of the oil supply passage. The cover 154 may be formed of a rigid material or a flexible material.

When the cover 154 is formed of a rigid material, the tubular shape is not deformed due to the rigidity of the cover 154, so that the oil transfer member 150 is easily fitted into the cover 154 while sliding, The cover 154 is easily engaged with the oil supply passage 117 of the main housing 110 while sliding. 5, the oil supply passage 117 is formed in a stepped manner so that the position of the oil transfer member 150 can be fixed in a state where the assembly of the oil transfer member 150 and the cover 154 is fitted.

When the cover 154 is formed of a soft material such as rubber, the cover 154 can be fitted tightly to the outer circumferential surface of the oil transfer member 150, So that it can be firmly fixed to the inner wall of the oil supply passage 117 of the oil supply passage 117.

Meanwhile, the decompression means can also be modified in the form shown in Figs. 6 and 7. Fig. In this modified example, the oil transfer member 160 is provided with an oil transfer groove 162 along its longitudinal direction.

The oil transfer member 160 is formed in a cylindrical shape and inserted in the longitudinal direction along the oil supply passage 117 of the main housing 110. The oil transfer groove 162 is formed in a spiral shape along the longitudinal direction of the oil transfer member 160. Accordingly, the oil passes through the oil transfer member 160 while spirally moving along the oil transfer groove 162. At this time, the distance of movement of the oil is longer than that of the oil passing through the oil supply passage 117 in a straight line, so that the pressure of the oil is decreased.

In the modified example, the oil transfer groove 162 is formed in the oil transfer member 160, unlike the modification shown in FIGS. 4 and 5, so that the oil transfer groove is not exposed to the outside. Therefore, the oil transfer groove 162 does not hit the inlet end or the inner wall of the oil supply passage 117 of the main housing 110 during assembly.

An oil guide groove 164 is formed at the tip of the oil feed groove 162. The oil guide groove 164 is formed to be larger than the cross-sectional area of the oil feed groove 162 so that the oil can be collected and guided into the oil feed groove 162. The oil transfer member 160 of the modified example has the oil transfer groove 162 provided therein so that the oil passage formed by the oil transfer groove 162 without damaging the cover 154 is damaged during assembly, .

Further, the decompression means may be modified to the form shown in Fig. 8, the decompression means 170 shown in this modification includes an oil transfer member 172 and an oil transfer groove 174b fitted in the outer peripheral surface of the oil transfer member 172 and having an oil transfer groove 174b in the inner wall 174a. Shaped cover 174 formed with a tubular shape. The oil transfer member 172 is formed in a cylindrical shape and inserted in the longitudinal direction along the oil supply passage 117 of the main housing 110.

The oil transfer groove 174b is formed on the inner wall 174a of the cover 174, not on the oil transfer member 150 as described above. The outer peripheral surface of the oil transfer member 172 is formed as a smooth surface and a threaded oil transfer groove 174b is formed in the inner wall 174a of the cover 174 so that the outer peripheral surface of the oil transfer member 172, The oil feed groove 174b of the oil groove 174 forms the oil passage.

The oil transfer groove 174b of the cover 174 is formed in a spiral shape along the longitudinal direction of the cover 174. Accordingly, the oil passes through the oil transfer member 172 while spirally moving along the oil transfer groove 174b. At this time, the distance of movement of the oil is longer than that of the oil passing through the oil supply passage 117 in a straight line, so that the pressure of the oil is decreased.

Claims (30)

A main housing;
A orbiting scroll pivotally mounted on the housing;
A fixed scroll engaging with the orbiting scroll to form a compression chamber; And
And an auxiliary housing having a discharge space communicated with the discharge side of the fixed scroll and a collecting space in which the oil collected in the discharge space is temporarily stored,
An oil recovery flow path formed in the fixed scroll and communicating with the trapping space; And
And an oil supply passage formed in the main housing and branched from the oil return passage so as to communicate with the oil return passage and supply oil to at least two locations. The method according to claim 1,
Wherein the main housing is provided with a suction space in which a rotary shaft is received, and the oil supply passage includes a first oil supply passage communicated with the suction space. 3. The method of claim 2,
A back pressure chamber is formed between a back surface of the orbiting scroll and an opposite surface of the main housing, and the oil supply passage includes a second oil supply passage communicated with the back pressure chamber. 3. The method of claim 2,
Wherein the oil recovery passage is provided with a pressure reducing means. 5. The method of claim 4,
Wherein the oil return passage is provided with an installation space for inserting the decompression means, and the inner space of the installation space is formed to have an inner diameter larger than an inlet of the oil return passage. The method of claim 3,
And the refrigerant pressure at the discharge side of the first oil supply passage is formed to be lower than the refrigerant pressure at the discharge side of the second oil supply passage. The method according to claim 6,
And the oil recovery means is provided in the first oil supply passage. 8. The method of claim 7,
Wherein the first oil supply passage is provided with an installation space for inserting the decompression means and the inner space of the installation space is formed to have a larger inner diameter than the discharge port of the first oil supply passage compressor. The method of claim 3,
Wherein the first and second oil supply passages have a common inlet port communicating with a discharge port of the oil return passages. 10. The method of claim 9,
And sealing means for sealing the back pressure chamber is provided between the orbiting scroll and the main housing, and the common inlet is disposed radially outward of the sealing means. The method according to claim 5 or 7,
Wherein the pressure reducing means includes an oil transferring member having an oil transfer groove formed on an outer circumferential surface thereof and extending in a spiral shape along a longitudinal direction thereof. 12. The method of claim 11,
Wherein the oil transfer member is provided with a hydraulic pressure space therein, and a communication hole communicating with the hydraulic pressure space is formed at one end of the oil transfer member. 12. The method of claim 11,
Further comprising a cover fitted to an outer circumferential surface of the oil feed member The method according to claim 5 or 7,
Wherein the decompression means includes an oil transfer member having an oil transfer groove formed therein extending spirally along the longitudinal direction. 15. The method of claim 14,
Wherein the oil transfer member is provided with a hydraulic pressure space therein, and a communication hole communicating with the hydraulic pressure space is formed at one end of the oil transfer member. The method according to claim 5 or 7,
The pressure-
An oil feed member; And
And a cover which is fitted on an outer circumferential surface of the oil transfer member and in which an oil transfer groove extending in a helical shape along a longitudinal direction is formed on an inner side wall. The method according to claim 1,
A sealing means for preventing refrigerant leakage between the fixed scroll and the main housing is interposed between the fixed scroll and the main housing,
And the sealing means is provided with a through hole for communicating the oil return passage and the first oil supply passage. The method according to claim 5 or 7,
Wherein the pressure reducing means is made of a material having lower stiffness than the fixed scroll and the main housing. A main housing having a suction space in which a rotary shaft is accommodated;
A orbiting scroll pivotally mounted on the housing;
A fixed scroll engaging with the orbiting scroll to form a compression chamber;
An auxiliary housing having a discharge space communicated with the discharge side of the fixed scroll and a collecting space in which the oil collected in the discharge space is temporarily stored;
A back pressure chamber formed in the main housing, the pressure being applied to press the orbiting scroll to the fixed scroll side;
An oil recovery flow path formed in the fixed scroll to communicate with the collection space and having a depressurizing means therein;
A first oil supply passage formed in the main housing and extending between the oil return passage and the suction space;
Pressure reducing means provided respectively in the oil return passage and the first oil supply passage; And
And a second oil supply passage branched from the two pressure reducing means and communicating with the back pressure chamber. 20. The method of claim 19,
And the second oil supply passage is provided with an inlet at one end of the main housing. 21. The method of claim 20,
A sealing means for sealing the back pressure chamber is provided between the orbiting scroll and the main housing, and the inlet is disposed radially outward of the sealing means. 20. The method of claim 19,
Wherein at least one of the oil return passage and the first oil supply passage is provided with an installation space for inserting the decompression means, and a step portion is formed at one end of the installation space. 23. The method of claim 22,
Wherein the step portion is formed so as to prevent the decompression means from moving and the decompression means to be positioned in the correct position. 20. The method of claim 19,
A sealing means for preventing refrigerant leakage between the fixed scroll and the main housing is interposed between the fixed scroll and the main housing,
And the sealing means is provided with a through hole for communicating the oil return passage and the first oil supply passage. 20. The method of claim 19,
Wherein the pressure reducing means includes an oil transferring member having an oil transfer groove for forming an oil transfer path together with the inner wall of the main housing or the fixed scroll. 26. The method of claim 25,
Wherein the oil transfer member is constituted such that a part of the oil is introduced into the oil transfer member and is configured to expand toward the inner wall by the pressure of the oil that has been introduced. 27. The method of claim 26,
Wherein the oil feed member is made of a material having lower stiffness than the fixed scroll and the main housing. 26. The method of claim 25,
Wherein the pressure reducing means includes a cover fitted to the outer circumferential surface of the oil feed member. 20. The method of claim 19,
Wherein the decompression means includes an oil transfer member having an oil transfer groove formed therein extending spirally along the longitudinal direction. 20. The method of claim 19,
The pressure-
An oil feed member; And
And a cover which is fitted on an outer circumferential surface of the oil transfer member and in which an oil transfer groove extending in a helical shape along a longitudinal direction is formed on an inner side wall.

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